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Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC

Abstract : We report measurements of single and double spin asymmetries for $W^{\pm}$ and $Z/\gamma^*$ boson production in longitudinally polarized $p+p$ collisions at $\sqrt{s} = 510$ GeV by the STAR experiment at RHIC. The asymmetries for $W^{\pm}$ were measured as a function of the decay lepton pseudorapidity, which provides a theoretically clean probe of the proton's polarized quark distributions at the scale of the $W$ mass. The results are compared to theoretical predictions, constrained by recent polarized DIS measurements, and show a preference for a sizable, positive up antiquark polarization in the range $0.05
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http://hal.in2p3.fr/in2p3-00992854
Contributor : Sylvie Flores <>
Submitted on : Monday, May 19, 2014 - 1:42:09 PM
Last modification on : Thursday, February 7, 2019 - 3:20:39 PM

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L. Adamczyk, W. Borowski, S. Kabana. Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC. Physical Review Letters, American Physical Society, 2014, 113, pp.072301. ⟨10.1103/PhysRevLett.113.072301⟩. ⟨in2p3-00992854⟩

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